Optimization of energy recovery turbine in demineralized water treatment system of power station by Box–Behnken Design method

Abstract

In order to improve the recovery efficiency of the energy recovery turbine in the demineralized water treatment system of the power station, the Box–Behnken Design (BBD) response surface method combined with CFX numerical simulation were used to calculate the outlet angle of the turbine impeller blade(β1),blade inlet angle(β2), blade thickness(h), which were selected as the three factors of BBD test design, and head H and efficiency η were two evaluation indexes, the design-exper10 software is used to test and analyze the test results, then the whole flow field of the optimized turbine model was analyzed with CFX numerical simulation. The results show that when the β1and β2are 24.6° and 22.4° respectively, and h is 3.8 mm, the turbine has the optimal hydraulic performance. The efficiency of the optimized turbine model is increased by 1.8% and the head is increased by 21 m under rated working conditions. The research may provide a good basis for the energy-saving transformation of demineralized water treatment system in power station.

Keywords

• Reverse pump as turbine
• Surface response method
• Blade thickness
• Inlet angle
• Exit angle
• Demineralized water